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Dec. 22, 1925. 1,566,630

T. E. STURTEVANT I ROCK DRILL FiledMay 1, 1920 I 2 b- A;

Patented Dec. 22, 1925. I

UNITED STATES THOMAS E. STURTEVANT, OF DOVER, NEW JERSEY,-ASSIGNOR TOMcKIERNAN-TERRY DRILL COMPANY, OF DOVER, NEW JERSEY, A CORPORATION OFNEW JERSEY ROCK DRILL.

Application filed May "1, 1920. Serial at. 378,090.

To all whom it may concern:

Be it known'that I, THOMAS E. 'STUR'rn- VANT, a citizen of the UnitedStates of America, and a resident of Dover, Morris County, and State ofNew Jersey, have in--. vented certain new and useful Improve ments inRock Drills, of which the following is a specification. V

The present invention relates particularly to hammer drills and theobjects of the invention are to simplify and to improve drills of thistype, particularly as regards the front end and bit supportconstruction.

The invention involves a number of novel features offconstruction,combinations and arrangements of parts as following specification. V

In the drawing accompanying and forming a part of this specification Ihave ildisclosed in the lustrated one of the practical embodiments ofthe invention, but wish it understood that the'structure may be modifiedwithout'departure from the true spirit and scope of the invention asdefined in the appended claims.

i ure 1.

Fig. 5 is a sectional plan view of some of the parts shown in the otherfigures of the drawing, the section being taken on the line 55 of Fig.3.

The numeral 5 in Figure 1 designates the piston guide between the frontend of the cylinder and the bit support structure of a rock drillingengine and 6 the fluted forward end of the piston operating therein.This fluted portion of the piston operates in the usual way in thefluted rotating nut 7 which is screwed or otherwise secured in the endof the carrier sleeve 8. novel construction in that its outer end isreduced as at 9 and provided with a bore 10 forming a guide for thedrill bit 11 and this bore is notched at opposite sides, as indicated at12 in Figure 2, to admit the wings or transverse lugs 13 of the drill.

The drill steel after being entered in the carrier sleeve is heldagainst rotation therein This sleeve is of by means of the'lock bushing14, formed with drive shouldersjl5 for 'e'ngagement'with' the wings ofthe bit which is secured nonrotatably-to the carrier sleeve by means ofthe longitudinal keys 16'welded in slots 17 formed in the sleeve andengaging'loosely' periphery of the g in key slots 18 cutin' the lockbushing 14.

These keys, as shown in Figure 3, are pref-' erably' disposed directlyoutside of the drive shoulders .15, said drive shoulders providingsufficient metal at these pointslforthe cutting of the key slots 18without weakening the strength of the lockbushing.

Also mounted in the carrier sleeve in back of the lockbushing are theusual guide 19 and spacer 20. f I 1 Another important feature of'.-thisinvention is the making of thecarrier sleeve 8 all 1n one pleas andconstructing it as a casing to provide the strong, rigid, unitarysupport for the lock bushing 14, bit guide 19,-

the spacer 20 and'therotary nut 7. Accord: ingly, I have provided acylindrical casing 21 in which the carrier sleeve is rotatably supportedand which is formed at its for- 'ward end with an inwardly extending.an-

nular flange 22 overlying'an annular shoulder 23 provided atthe outerend of the car-' rier sleeve 8. Also the forward end of the.

carrier sleeve is shown as reduced and as having a bearingat 24 in theannular con- The"construction disclosed is particularly" simple andstrong and consists of but few parts, which are readily assembled anddisassembled as required. The carrier sleeve when removed from thecasing carries with it the lock bushing 14, the bearing bushing 19, thespacing sleeve 20 and the rotating nut 7, which assembly may be treatedas a single unit as the nut holds these parts together tightly. Theseseveral parts are, however, readily removable from the carrier byunscrewing the rotating nut 7 which, when it is removed, permits theother parts to slide out of the carrier. A further advantage followsfrom the fact that the nut, the spacer, the bearing bushing, the lockbushing and the carrier are all separate parts, because these parts maythen be made from difierent materials, each suited to a particularpurposeand designed! to standthe wear and'strains to which it is to besubjected. The construction also enables ready renewal of any of theseparts in case they should become worn or broken.

What I claim is:

1. In a drill of the character described,

7 the combination with a cylinder anda reciprocable piston therein, of acarrier sleeve having a reducechend plTOvidfid. With. gll dfi b re for te shankot a'drill;hit., a loek bushr ing confined: within said, sleeveandkeyed. theret a. casing rotatably, w r g. the car.-

. e Slee nd-i s cu o e cyl nder aid; sina av ng. ni nteg al' annular flage gaging the reduoed; end of; thevcarrier Sleev and rotatably confiningthe. carrier sleeve! ther ein, a nut in the end ot-the carrier sleeve 7opposite its reduced end, and, meansin, the

carrier sleeveibetween thenutand lock bush ing, a ang d; o coope atewith. he, nut to holdithe look bushing in position andlto slid,

ably but non-'rotatively eonnec't the carrier sleeve with the piston.

n" a ri l f he des i a casing, a carrier sleeve rotatably eonfined" ienle and mean in he car ier; lee e e een; he n maths 00k b sh ng. a ii. ocooperate with. he to h d...

said lock bushing inposition. V

3' n a i l, f he ha a r de cribed,

h ne-nan w h. acy ind r, and. a; re!

ip q ble p ton h r in,;, tia.car e sleeve having a pen nd. duqed nd; prs vide wi h. guirl'erj are orhe [s ankz -i' r lj b ancl'"' et es.,tending ater lly from h-bare, ksye nsai gnid save, a

lock bushing insertable ,inthe sleeve through the open end thereof andengaging the reduced" end portion of the sleeve, said lock bushing beingprovided with grooves in its outer surfacev in, line with saidkteyand'ha 5 ing progecting drive shoulders on K511111131 wall disposedsubstantially in line with the keygrooves in its outer surface, forengaging lateral projections on the drill bit and a nut in the end otthecarrier sleeve opposite its reduced end arranged to hold the lockbushing inpositiOn and to slidably but nonrotativel'y connect thecarrier sleeve with the piston, combined with a drili" bit having ashank fitting the bore in the redu'cedend' of; the carrier sleeve andlaterally extending lugs a daptedj to passjthrough the notches.

4. In a drill of the character described, the combination with acylinder and a. reciprocable piston therein, of a. carrier sleeve havingan openend anda reduced'end" pro vided with a guide bore for the shankof a drill bit and notches extending laterally, from said bore, keys insaiJd' guide sleeve, a lock bushinginsertable in the sleeve through theopen end thereof and engagingjthe reduced end portion of'the sleeve,said lock bushingbeing provided, with grooves. in its outer surface inlinewith'said keys and hav ing projecting drive shoulderson its, inner:7.

wall disposed o substant-iall'y in line with the key grooves in'itsouter surface for engaging. lateral projeetionson the drill bit and 'anut in the end of the carrier sleeve opposite its, red'uced'end'arranged to hold the lock bushingin position and toslidably butnonrotatively connect-the carrier sleeve with the piston and a spacerbetween the nut and the lock bushing having a guide bore for. the drillbit. shank, con1b ined with a drill bit hav ng a shankjfitt ngthe bor sll e duced'end of the carrier sleeve andin; the spacer and" laterallyextendinglugs adapted topass throughthe notches.

In witness whereof, I have hereunto. set

